Simulation on Design Based on Superbuck Converter

The power system is an important part of the spacecraft. The Superbuck converter is a high-order topology with continuous current and high efficiency. However, when the main circuit parameters are improperly selected, the right halfplane (RHP) zero-point exists in the small-signal model of the converter, which increases the difficulty of the control system design. In this paper, methods such as increasing the damping loop and optimizing the control loop are used to improve the stability of the converter. The main circuit parameters were analyzed and calculated. The PSIM software was used to analyze the time domain transient, frequency domain characteristics, ripple and parameter scanning of the circuit model with parasitic parameters. The voltage control method was selected and the modules of the control loop were designed. The Bode plot shows that the system is robust enough and stable. In addition, using the CST software to simulate the electromagnetic field distribution of the devices. The simulation results can lay a good foundation for the actual production in the next step. Due to its unique advantages, Superbuck circuit will have broad application prospects in the space power controller unit(PCU).